;
; Copyright (C) 2024 The Goldfish Scheme Authors
;
; Licensed under the Apache License, Version 2.0 (the "License");
; you may not use this file except in compliance with the License.
; You may obtain a copy of the License at
;
; http://www.apache.org/licenses/LICENSE-2.0
;
; Unless required by applicable law or agreed to in writing, software
; distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
; WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
; License for the specific language governing permissions and limitations
; under the License.
;

(define-library (liii vector)
(import (srfi srfi-133)
        (srfi srfi-13)
        (liii base))
(export
  ; S7 Scheme built-in
  make-vector vector vector-length vector-ref vector-set! vector->list list->vector
  ; from (scheme base)
  vector-copy vector-fill! vector-copy! vector->string string->vector
  vector-map vector-for-each
  ; from (srfi srfi-133)
  vector-empty?
  vector-fold vector-fold-right
  vector-count
  vector-any vector-every vector-copy vector-copy!
  vector-index vector-index-right vector-skip vector-skip-right vector-partition
  vector-swap! vector-reverse! vector-cumulate reverse-list->vector
  vector=
  ; Liii Extras
  vector-filter
)
(begin

(define (vector-filter pred vec)
  (let* ((result-list (vector-fold (lambda (elem acc)
                                     (if (pred elem)
                                         (cons elem acc)
                                         acc))
                                   '()
                                   vec))
         (result-length (length result-list))
         (result-vec (make-vector result-length)))
    (let loop ((i (- result-length 1)) (lst result-list))
      (if (null? lst)
          result-vec
          (begin
            (vector-set! result-vec i (car lst))
            (loop (- i 1) (cdr lst)))))))

) ; end of begin
) ; end of define-library

